(VB.NET UWP/WinRT) Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim imap As New Chilkat.Imap

' Connect to an IMAP server.
' Use TLS
imap.Ssl = True
imap.Port = 993
Dim success As Boolean = Await imap.ConnectAsync("imap.someMailServer.com")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Login
success = Await imap.LoginAsync("****","****")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Select an IMAP mailbox
success = Await imap.SelectMailboxAsync("Inbox")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


Dim messageSet As Chilkat.MessageSet
' We can choose to fetch UIDs or sequence numbers.
Dim fetchUids As Boolean = True
' Get the message IDs of all the emails in the mailbox
messageSet = Await imap.SearchAsync("ALL",fetchUids)
If (imap.LastMethodSuccess = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


Dim numFound As Integer = messageSet.Count
If (numFound = 0) Then
    Debug.WriteLine("No messages found.")

    Exit Sub
End If


' Get the 1st 10 messages in messageSet.
Dim upperBound As Integer = 10
If (numFound < upperBound) Then
    upperBound = numFound
End If


Dim i As Integer = 0
Dim bUid As Boolean = messageSet.HasUids
While i < upperBound

    Dim email As Chilkat.Email = Await imap.FetchSingleHeaderAsync(messageSet.GetId(i),bUid)
    If (imap.LastMethodSuccess = False) Then
        Debug.WriteLine(imap.LastErrorText)

        Exit Sub

    Else
        ' Do whatever is needed with the email.. 
        ' ....


    End If


    i = i + 1
End While


' Alternatively, create a new message set containing the 1st 10 message id's (UID's) 
' from the search results message set:
Dim firstTen As New Chilkat.MessageSet

For i = 0 To upperBound - 1
    firstTen.InsertId(messageSet.GetId(i))
Next



' Download the 1st ten headers:
Dim bundle As Chilkat.EmailBundle
bundle = Await imap.FetchHeadersAsync(firstTen)
If (imap.LastMethodSuccess = False) Then

    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If



' Other examples show how to iterate over the emails contained within the bundle...


' Disconnect from the IMAP server.
success = Await imap.DisconnectAsync()